Micrometer-gage



(No Model.) v

A. H. EMERY.

MIOROMETER GAGE. I No. 364,913. 23 Patented June 14, 1887.

UNITED STATES PATENT O FICE.

ALBERT H. EMERY, OF STAMFORD, CONNECTICUT.

MlCROMETER-GAGE.

SPECIFICATION forming part of Letters Patent No. 364,913, dated June 14, 1887.

Application filed April 20, 1886. Serial No. 199,5i8. (N mo.lcl.)

- which the other jaw slides, and with a micrometer-screw turning in one jaw and working in a screw-socket in the other to set the jaws at the required gage .distance. Each jaw is made of separable parts and provided with setscrews to preserve the necessary closeness of fit between the respective sockets and the guide-bars and micrometer-screw. The graduated head or collar of the micrometer-screw 1s made adjustable and clamped between a collar on the screw and apair of lock-nuts, so that it may be set accurately at zero when the aws are in contact. The paired jaws are con structed with two or more pairs of external gaging-faces for internal measurements, afford 1ng wide range of capacity with asmall move ment of thejaws, and they are provided with extension gage-legs affording still greater ca paclty. The two ends of the paired jaws are diverse, the said jaws comingclose together at one end, while at the other end they diverge to a distance equal to the entire movement of the jaws. This provision affords great range of adjustment for external measurements. For example, supposing the possible movement of the jaws to be one and one-half inch, accurate outside measurements up to this limit may be taken by the use of one end of the instrument, while the other end, beginning at one and one-half inch at its closest adjustment, will give accurate measurements from this up to three inches.

To enable the handling of the gage without changing the dimensions of its parts bythe communication of heatfrom the hand of the user to the metal of which the gage is made, it is provided with holding-buttons of wood or other material which. is a poor conductor of heat, and these buttons are preferably made with concave faces.

In the accompanying-drawings, Figure I is a side viewof a gage illustrating the invention, having two guide-bars. Fig. II isa side view of a gage, also embodyingthe invention, and having one guide-bar. Fig. III is an end view of the gage shown in Fig. II. Fig. IV is a front view ofthe same.

The jaws 1 2 have a parallel movement to and from each other. They are constructed with separable cap-plates 3 4, secured to the jaws by set-screws 5 6 7 8 and 9 10 11, respectively. The screws 5 6 8 fix the guide bar or bars 13 13 immovably in thejaw 1,while the screws 9 10 11 adapt the jaw 2 to move with the requisite freedom on the'said guide bar or bars, and also afford means of adjusting the screw-socket formed in said jaw accurately to fit. the micrometer-screw 14. If it be desired to fix the jaws at any given adjustment, this is done by the use of the locking thumb-screw 12 without interfering with the adjustment of the set-screws 9 10 11.

15 15 represent concave-faced holding-but tons of wood or like non-conducting material.

The micrometer-screw is formed with a fixed collar, 16, and provided with a screw-collar, 17, (shown in dotted lines,) by which it is con fined and adjusted longitudinally in thejaw 1, and with a graduated head, 18, which turns on the screw for the purpose of setting its zeromark accurately to the indicator 19 when the jaws 1 2 are-close together or at any determined gage distance. It is then clamped against the screw-collar 17 by the lock-nuts 20 21, so as to form a fixed part of the micrometer-screw.

The internal gage-faces for external measurements are shown at 22 22 and 28 28, respectively, and the external faces for use in internal measurements at 23, 24, 25, and 29, and the external gagelegs at 26 27. The faces 23,

24, and 25 are made cylindrical, to adapt them for gaging curved internal surfaces, and the faces of the extension-legs 26 convex for the same'purposc, while the faces 29 and 27 are made flat for gaging parallel faces only.

A series of legs, 26 27, of various standard lengths, may be used to adapt the gage to a greater range. a r

The provision of the diverse gaging-faces 22 and 28 gives to the gage a range for external measurements equal to double the run of the micrometer-screw, the faces 28 when the faces 22 are together being ground to a gage distance equal to the run of the screw, and in like manner the provision of the diverse external gaging-faces, 23 24 25 26 27 29, affords a great range of adjustment for internal measurements with a small movement of the micrometerscrew; for example, the micrometer screw having a movement of an inch and onehalf, the gage shown will measure all possible internal dimensions from three and onetwentieth to five and one-half inches, which may be further increased by the use of longer extension-legs.

The guidebars 13 13 may have a series of graduations on their sides corresponding to different gaging-faces. The graduations shown on the bar 13 may refer to the faces 22, while the graduations on the bar 13" refer to the faces 24 and 28.

The broad principle of providing a gage with holding-pieces of non-conducting mate rial is described and claimed in my application No. 199,515, filed of even date herewith, and designated Case A, the peculiarity in the present application being that the holdingpieces take the form of buttons with concave ends for the reception of the thumb and finger. I have also described and claimed in said Case A, No. 199,515, the use of set-screws to adjust the screw socket or nut to the micrometerserew, in combination with a locking-screw, by which, without disturbing such adjustment, the micrometer-screw may be fixed for the time being at any point to which it is set.

A movable gagehead made in two parts, to embrace a bar on which it is fitted to slide, I have described and claimed in another application of even dateherewith, designated Case C, and numbered 199,547.

The graduated micrometer-collar adjustable relatively to the micro meter-screw and adapted to be locked thereon I have described and claimed in another application of even date herewith, designated lase C, and numbered 199,547.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. A micrometer-gage constructed with a gaging-head in which the micrometer-screw turns, one or more guide-bars secured therein, and a second gaging-head sliding on the guide bar or bars and carrying the micrometer-nut, the latter head being split or made in parts, and having adj usting-screws to fit it accurately to the guide bar or bars and to the micrometor-screw, and a locking-screw for locking it in the position to which it may be set, substantially as described.

2. The combination of a pair of gagingheads, 1 2, a micrometer-screw, 14c, turning in one of said heads without longitudinal movement, and threaded in the other, and one or more guide-bars, 13, said head 2 being partially or wholly split or made in parts, and provided with set-screws, by which it is adjusted to the guide bar or bars and to the micrometer-screw, substantially as and for the purposes set forth.

3. A gage constructed with two gagingheads, one or both adjustable on a guide-bar, each having one or more gaging-faces, in combination with an extension leg or legs, 26, on either or both heads, substantially as set forth.

4.. A gage constructed with two gagingheads, one or both adjustable, each having one or more external gagingfaces for internal measurements, in combination with an extension leg or legs, 26, on either or both heads, substantially as set forth.

5. A gage constructed with a pair of gaging-heads, l 2, one or more guide-bars, 1.3, microincter'screw 14-, and two pairs of extension-legs, 26 27, one pair having convex and the other flat faces, substantially as set forth.

6. The heads 1 2 of a micron'ieter-gage,having eoncavefaced holding-buttons 15, of mm conducting material, substantially as and for the purpose set forth.

ALBERT II. EMERY.

\Vi tnesses:

OCTAVIUS KNIGHT, F. A. HorKINs. 

